How to check the existence of Email quickly?

Question

PHP

Need on this site - stealthdebuger.com/post to check email addresses for existence in PHP. I checked it through curl (not asynchronously) and it was checked for a very long time. And you need to check 140 thousand addresses. So how can this be done as quickly as possible?

Answer 1

and he, this site, will cope with "well, very quickly"?
Use the multicurve then

Answer 2

Sometimes it is useful to write through the return line. Can give access to api.